I strongly not to recommend thi site ... I already tried it before( liitle amount of bitcoin only) ..and didn't receive any payback reward..its just wating for nothing at all .
Hope that experience of yours will serve as a lesson to you.
Is there any one who has summary or list of scam sites?
No one will try to make a list scammers/scam websites because even a website is taken down it's easy to make a new website like what cloud mining sites and will operate again and again. If you see some list I bet it's not updated and not all scam sites are listed there.Well this is not really true.... try this site: